Radio Receivers
If a FET is used as the first AF amplifier in a transistor receiver, this will have the effect of

Improving the selectivity of the receiver
Reducing the effect of negative-peak clipping
Reducing the effect of noise at low modulation depths
Improving the effectiveness of the AGC

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Radio Receivers
In a broadcast superheterodyne receiver, the

Mixer input must be tuned to the signal frequency
Local oscillator frequency is normally double the IF
Local oscillator operates below the signal frequency
RF amplifier normally works at 455 kHz above the carrier frequency

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Radio Receivers
The local oscillator of a broadcast receiver is tuned to a frequency higher than the incoming frequency

To help the image frequency rejection
To allow adequate frequency coverage without switching
To permit easier tracking
Because otherwise an intermediate frequency could not be produced

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